#include<iostream>
#include<string>
using namespace std;

class Person
{
public:
	string _num = "610422";
};

class Student : public Person
{
public:
	string _num = "2023";
};

class Class : public Student
{
public:
	string _class = "17";
};

int main()
{
	Class c1;
	cout << c1._num;

	return 0;
}